The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Apr. 02, 1999
Takashi Endo, Minowa-machi, JP;
Manabu Oka, Minowa-machi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A voltage-controlled piezoelectric resonator may be implemented without requiring the use of a trimmer capacitor by virtue of the use of a capacitor array with or without an additional capacitor array, thus reducing the number of external parts. The capacitor array and the additional capacitor array can be packaged in an IC, thus enabling reduction in the size of the voltage-controlled piezoelectric resonator. The voltage-controlled piezoelectric resonator incorporating the capacitor array exhibits high stability both in terms of secular change and operation, which in turn ensures high stability of operation of a piezoelectric oscillation circuit incorporating this voltage-controlled piezoelectric resonator. An oscillation center frequency adjusting mechanism produces adjusting data, so that the adjustment of the oscillation center frequency can be effected purely electrically. Since mechanical adjusting operation that is essential in conventional arrangements is unnecessary, the time required for the adjustment of the oscillation center frequency is shortened to allow a reduction in the production cost of the voltage-controlled piezoelectric resonator.